Spring-hammer.



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vApplication filed November 112,419'12. Serial Zito; 730,843.

To all 107mm it "may concern Bo it known .that I, HARRY T. Goss, citizien of the United States, and a resident of Rutherford, county of Bergen, andState of *New Jersey', haveinvented certain n ew and useful Improvements in Spring-Hammers,

vwhich Athe following is a specication, Areference being had to' the accompanying drawings, forming a part thereof.

My invention rela-testo percussive tools` and it has special reference to such as emtureswhich shall particularly adapt it for,

such uses as the drilling of stone, brick or concrete.

Other objects will beset forth hereinafter.

1n the drawings: Figure 1 is alongitudi- 4 nal section through its central plane, of ai spring'hammerl constructed in accordance with my invention. Figs. 2 and 3 are transverse sectional-plan views onthe lines 2 2 and 3-3 respectively of Fig. 1. Figa is an elevation at right anglesY to Fig. 1, and Figs, 5 'and 6 are transverse sectional plan 'views on the lines 5 5 and 6--6 of Fig. l.

Like characters of reference designate corresponding parts in all the figures.

Referring to the drawings, the device here shown comprises a tubular body or barrel 11, a handle member 12, a tool holder or chuck 13, a hammer or striker' 14, an actuating compression spring 15, a cam 16 and an operating crank or lever 17. I The tool holder or chuck 13 is aflixed to the lower end of a rota-table cylindrical tube or quill 20. Its lower end projects inthe l Aform of'a flange 18 beyond the bottom of the quill. its upper end 19 is of smaller diameter and fits rotatively Within the lowerV end of the tube or barrel 11. This lower end ofthe barrel 11 rests upon a shoulder lon'tlie chuck which takes the thrust due to y, the reaction of the tool.

lThe cam 16 has a notched periphery which gives it the general form of a ratchet. lt is i secured to a transverse shaft 25 at one side alt-the barrel.' The shaft is .supported in hearings 26 and 2? provided in the respec Speccation of Letters atent.

eretitel-'nennen I tive halves of a divided casing or housing 30 which lncl'oses the cam.l

The parts of the vcasing or. housing 30 provided with jaws 31 which are adapted parts of the housing are clamped together by machine screws or bolts 32'. The crank terially beyondfthe bearings 26 and 27 forthis purpose; The casing or housing is further provided with a hollow boss projection:

35 which is co-axial with thebarrel 11 and is adapted to receive and form a bearing for the quill 20. The casing is enlarged to provide a substantially annular recess 36, adjacent the boss 35 in which a ratchet 37 is located.` Thisl ratchet is aflixed to the upper end of the quill which extends through the boss into the casing. The arrangement of parts is such that ,the quill is held in position hy the ratchet 37 while the quill and ratchet togetherare free to rotate in the hollow boss 35 as a.V bearing.

A pawl carrier 40 is interposed between the ratchet 37`and the surface of the adjacent set of jaws 31. It loosely surrounds the barrel 11 and is provided with a 1projection *el which has anfupwardly'projecting camv 1 surface 42 and a pin L13 on whicha. pawl .1.4;

is pivotally supported. The pawl is adapted to coperate with the teeth of the ratchet 37 and is held in engagement with them by a spring 45.

The pawl support L10 is limited to one direction of rotation by a stationary stop 46 which is secured tothe housing 30 and it is normally held in position by a spring 48.

Patentes mais, i915; l

to grip the tube ory barrel 11 when the two The hammer or striker 14 is slidably supported within the barrelll near the chuck 13 and is provided with a slot 50 which is directly opposite a slot 52 in the barrel 11.

The inner end of the hammer or striker is provided `with a boss 5% .which extends into one end of and centersthe spring 15 which tends to hold the hammer'or striker `in engagement with' the inner end of a drill orother 'tool 58. The shank 59 of the tool is square and extends through a square hole in the chuck 13. Any suitable structure which permits the longitudinal movement of .the tool in the chuck but prevents the relative rotation of the two may be used.

The site of the cam 16 and the position of Vsupported between the forks 61'of a U- shaped or bifurcated projection in` a well known manner. The handle member further comprises a split hollow portion 62 which is litted onto the opposite end of the barrel from the chuck and is firmly clamped by a bolt 63 and further held in position by a set screw 64. The handlemember ispprovided with a recess 65 which is open at one side as clearly shown yin Fig. 5 and is adapted to receive a knurled adjusting nut 66. l The'tension of the spring 15 depends upon the-position of an adjustable stop 67 which is tted into one end of the barrel v11 and is provided with a boss 68 which is opposite and corresponds to the boss 54 of the hammer or striker, the spring 15 being interposed and compressed between the hammer and the stop.

i The stop is provided with a'screw-threaded shank 69 onto which the nut 66 is screwed and which extends into a cylindrical hole in the handle member 12. This hole has a smooth bore and is only intended to guide the stop when it is adjusted longitudinally of thebarrel by turning the nut 66. The stop is prevented from rotating with the nut, by a pin-70 which extends through a transverse hole 71 in the handle member into a longitudinal slot or keyway 72 in the shank .j .69ct the stop. 40

- One of the parts ofthe housing 30 is provided with a projecting lug 8O having a hole 81 through it, parallel with the barrel. `A set screw 82 fixes the position of a small rod 83 which passes through the hole 81 and is used as a gage.

The operation of the tool is as follows:

Assuming that the parts occupy the posi-.

' tions in which they are shown in the drawings, lif the shaft 25 is rotated by the Icrank lever 17 in a clockwise direction, a tooth 90 of the cam 16 will move the hammer or striker in the barrel 11 in opposition to the spring 15 which is thus' compressed. At the same time another tooth 91 of the cam acts upon the cam surface 42 of the pawl carrier 40 so as to produce a rotative adjustment of the pawl carrier in opposition to the spring v 48. lThe pawl carrier turns the quill 20 and the chuck 13 through a predetermined angle by reason of the engagement of the pawl 44 with the ratchet 37. The -arrangement of parts is such thattherotative adjustment of the quill corresponds to one notch of the ratchet and consequentlv when thepawl car- Iier sreleased and returned by the spring the hammer or striker and compressed the spring, it will release the striker, if the r0- tation o f the shaft 25 is continued, and willl permit 1t to'be thrownuin'to percussive engagement with'the inner end of` the tool.

This action is repeated for each tooth-of. the cam andas a result a series of hammer-blows are directed against the end of' the tool.-l Furthermore between each blow of the' striker, the tool is slightly rotated'thereby producing the most desirable combination for stone drilling. Any suitable tool may' I be mounted in the 'chuckand the device usedV for various purposes. The force of the' blow struck by the striker or hammer may be adjusted by turning the nut 66 and therelby changing the position of the stop 67 to vary the compression of the spring 15. The crank lever may of course be mounted on either .end of the shaft 25 or two crank levers may be employed instead of one.

The gage 81 forms a simple and adjust'- able means for predetermining the depth of the holewhich is drilled by the tool, the end of the gage coming into engagement with the surface of the work as shown in Fig. 4 when the hole is to the proper depth. Attention is-directed to the, fact that the parts of my spring hammer arecomparatively few in number and are all relatively simple. The tool is `furthermore easily assembled=and inexpensive to construct.

Another advantage of my invention arises from the fact that no gears are embodied in its construction and the only screw threaded part-s are -smalland simple and may be easily manufactured on an automatic screw spirit and scope of my invention and I desire that only .such limitations be imposed as are indicated in the appended claims.

What I claim is:

1. A spring hammer comprising a barrel, a stop at one end of the barrel, `a nonreciprocable chuck at the opposite end of the barrel, a striker in the barrel adja cent to the chuck, a spring interposedbetween the stop and the striker,'means for intermittently moving the striker in opposition to the spring, .a quill surrounding one vend of the barreland secured to the chuck and means dependentupon said irst named means for producing a series of rotative adjustments of the quill and the chuck, said chuck being adapted to receive'reciprocable steel' A spring' hammer comprising a barrel, a. nonreclproeable chuck' -iotatively sup- .portedet one end, e 'striker in the barrel, a sprlng actingjon the strlker, wca'eing secured t0 the barrel intermediate its endeand g the adjacent. enel of the barrel and rote?V tively'4 mounted' inl said, boss, a ratchet seclired toftlielend of the quill Within the cassing; .arotgiteblejpwwl carrier adjacent to said .ratchetz a. spring tending to hold 'the pawl calrien ina predetermined position', a -pa-Wl pivo'ted'on Athefoa rurier and coperatingwvith 4the ratchet, and single cam iotatively l5 mounted in the casing and having 'a toothed periphery adapted-Kto actuate the striker and; .to'produce intermittent rotative nriovemeints of the'ratchetzindi chuck,y said chnckbeing 'aclafpte to' receive eciproca'ble drillsteel, 'A

In Witness whereof I heve hereunto set my 'hand this 11thy day of November, 1912, in' the :presence of twowitnessesp HARRY fr.' GeSs. -Wtnesesc7 SAMUEL HALIBUTT, J. DEABBORN. 

